History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
So the Athenians, after fortifying in six days the side towards the interior, and what most required it, left Demosthenes there with five ships to protect the place, while with the main body of the fleet they hastened on their voyage to Corcyra and Sicily.